Path: utzoo!utgpu!mnetor!charles
From: charles@mnetor.UUCP (Charles Stoner)
Newsgroups: comp.windows.x.motif
Subject: problems creating and destroy app shells
Message-ID: <5613@mnetor.UUCP>
Date: 30 Nov 90 21:32:46 GMT
Reply-To: charles@mnetor.UUCP (Charles Stoner)
Organization: Motorola Technical Systems Division, Toronto Design Centre
Lines: 57

I am having trouble creating (and destroying) application shells.  The code
below is a distilled version of the original source so while it may not do
anything useful, all lines have a purpose.

The code should produce a topLevelShell containing one button, that when hit
will manage and unmanage a prompt dialog and also create and destroy an
application shell.  The prompt dialog is created once and attached to the
button while the application shell is created and destroyed dynamically.

When the button in the main app shell is hit a few times the program will crash.
All lines seem to be necessary to generate a memory fault, even keeping
the prompt dialog modal.  I have tried the dynamic shell as both a
topLevelShell and a transientShell.  Other than transientShells being
iconified when the client is iconified, is there a difference?

I am using X11R4 and Motif 1.1 and compiling with gcc 1.35 and Motorla UNIX
sys V 3.0.

Am I missing the obvious?  Any feedback would be appreciated.
Thanks in advance - Chuck.

/*--------------------- cut here -------------------------*/

#include <X11/Intrinsic.h>
#include <X11/StringDefs.h>
#include <X11/Shell.h>
#include <Xm/Xm.h>
#include <Xm/PushB.h>
#include <Xm/SelectioB.h>

static Widget	prompt;

static void	subshell(Widget w,XtPointer client_data,XtPointer call_data) {
	Widget	shell = XtCreateApplicationShell("shell",
				transientShellWidgetClass,NULL,0);
	XtDestroyWidget(shell);

	XtManageChild(prompt);
	XtUnmanageChild(prompt);
}

void	main(int argc,char **argv) {
	Widget	shell;
	Widget	button;
	Arg	arg;

	shell = XtInitialize("shell","Shell",NULL,0,(Cardinal *) &argc,argv);

	XtManageChild(button = XmCreatePushButton(shell,"button",NULL,0));
	XtAddCallback(button,XmNactivateCallback,subshell,NULL);

	XtSetArg(arg,XmNdialogStyle,XmDIALOG_APPLICATION_MODAL);
	prompt = XmCreatePromptDialog(button,"prompt",&arg,1);

	XtRealizeWidget(shell);
	XtMainLoop();
}